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# File activerecord/lib/active_record/relation.rb, line 529def tables_in_string(string)return[]ifstring.blank?# always convert table names to downcase as in Oracle quoted table names are in uppercase# ignore raw_sql_ that is used by Oracle adapter as alias for limit/offset subqueriesstring.scan(/([a-zA-Z_][.\w]+).?\./).flatten.map{|s|s.downcase}.uniq-['raw_sql_']end